I was looking at Big Bad Toy Store's online shop in hopes to preorder the next wave of the Generations series.
I was perplexed, however about how they were labeling their sets of 4 and could not determiine what the "next waxe" was exactly. For example, you can get a set of 4 of Series one, containing Optimus, Bumblebee, Drift and Thrust yet Series Series two contains Optimus, Bumblebee, Darkmount and Megatron. Series 3 which is the one I think I need to get next has Megatron, Soundwave, Darkmount and Red Alert. Also thrown in randomly in some packs for good measure is Dirge and Blurr which I can't seem to find a definitive category for.
Maybe because I'm not a long time collector I'm missing some key elements in the way they are organised, but can anyone just tell me which ones are coming out next or clue me in on how to decode their listings?

Or if there is any better place to be getting these considering I live in Australia. The figures here are $30 AUD and even converting and adding shipping, it seems getting them from elsewhere is still cheaper.
Thanks for any advice

Adrobiel.